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Mergers and acquisitions - Consideration for Franklin Financial Network (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 15, 2020 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Business Combination, Consideration Transferred [Abstract] |  |  |
Shares and net shares outstanding (in shares) | shares | 15,651,243 |  |
Goodwill resulting from merger | $ |  |  | $ 31,961
Franklin Financial Network, Inc. |  |  |
Business Combination, Consideration Transferred [Abstract] |  |  |
Shares outstanding (in shares) | shares | 15,588,337 |  |
Options converted to net shares (in shares) | shares | 62,906 |  |
Number of shares outstanding including converted options (in shares) | shares | 15,651,243 |  |
Exchange ratio | 0.965 |  |
Shares to be issued as merger consideration (in shares) | shares | 15,102,492 |  |
Issuance price (dollar per share) | $ / shares | $ 29.52 |  |
Value of stock to be issued as merger consideration | $ | $ 445,826 |  |
Tax withholding on vested restricted stock awards, units and options | $ | (1,308) |  |
Value of stock issued | $ | $ 444,518 |  |
Net shares issued (in shares) | shares | 15,058,181 |  |
Stock units that do not vest on change in control (in shares) | shares | 114,915 |  |
Replacement awards issued to employees (in shares) | shares | 118,776 |  |
Fair value of replacement awards (in shares) | shares | 3,506,000 |  |
Fair value of replacement awards attributable to pre-combination service | $ | $ 674 |  |
Cash consideration per share (dollar per share) | $ / shares | $ 2.00 |  |
Cash to be paid | $ | $ 31,330 |  |
Purchase price | $ | 477,830 |  |
Preliminary fair value of net assets acquired | $ | 410,639 |  |
Goodwill resulting from merger | $ | $ 67,191 | $ 67,191 |
Equivalent value of parent stock (in shares) | shares | 44,311 |  |
Cash paid in lieu of fractional shares | $ | $ 28 |  |

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